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- An analyte with a partition co-efficient of 4.0 is extracted from 10 mL of the aqueous phase (Phase 1) into an organic Phase (Phase 2). What volume of the organic phase is needed to extract 90% of the analyte in four extraction using equal volumes? (Show your Calculation)02:21 4G File Details 4CH003/UM1: Fundamentals of... Introduction Perhaps the cleanest method of conducting an oxidation is by catalytic oxidation, since this minimizes the problem of removal of unwanted by- products. However, the conditions used are often vigorous and require the use of specialized equipment. By comparison, the product of a "chemical" oxidation may be more difficult to purify due to the presence of the reduced form of the oxidizing agent and potential "tars" that may arise from "over- oxidation". Because chemical oxidation can be carried out using conventional equipment they are more popular. dissolving sodium or potassium dichromate in acid is a commonly used oxidizing agent, being classed as a relatively powerful oxidant and having water soluble by-products (Cr III salts). Sulphuric acid is generally used if the material to be oxidized is water soluble and glacial acetic acid is used if it is Chromic acid, prepared in-situ by not. Alcohols are readily oxidized to…10) What is the purpose of a brine wash (saturated sodium chloride solution) in a liquid/liquid extraction? a) Sodium chloride is alkaline and, therefore, is a good way to neutralize acidic species such as HCl or H2SO4. b) Washing with brine is convenient way to remove residual water from the organic layer prior to treating the organic layer with a solid drying agent. Sodium chloride is an organic soluble material which provides a "seed" which c) encourages crystal growth. d) Sodium chloride aids in dissolving materials that are typically insoluble in both organic and aqueous media.
- chains. 2. During the chromatography the solvent may be changed from hexanes/ ethyl acetate (8:2) to hexanes/ ethyl acetate (4:6) depending on which ferrocenes are present in the mixture. What is the reason for doing this? Which of these solvent mixtures is more polar? How would you prepare 200 mL of hexanes/ ethyl acetate (8:2)? 00 use in ww Page 4 of 5 1483 words English (United States) O Focus PDIE IRRIEE VRIETTER IN AVILIYARK E etv MacBook Air3. Below are two other organic dyes that both produce a yellow color when dissolved. Which of the solvents (water, ethyl acetate, ethanol, dichloromethane, HC1) (select one solvent for each dye (dyes include disperse red 13 and methylene blue) could be used to dissolve samples of each of the dyes (individual samples, not a mixture)? HN- Radiant Yellow =1 долод Alizarine Yellow OH Na10g coffee 4g sodium carbonate 40m dichloromethane 160ml distilled water coffee filter What are the principles behind caffeine being extracted from coffee using the above items? 1st sodium carbonate mixed with coffee then brought to a boil for 20min then solution/grinds are filtered. Then solution is added to a separatory funnel with 15ml of dichloromethane and two layers are observed so the bottom layer with DCM contains the caffeine, then this layer is collected in a beaker and dried out using molecular seeds. Then the solvent is brought to a boil with crude caffeine remaining and recystallized using 95% ethanol and brought to a boil again. Then the contents are vaccum filtered and allowed to dry resulting in 30mg caffeine.
- Which error will lead to negative deviation from the theoretical Keq? a. cuvette was filled to the brim with the sample. b. cuvette was washed with sodium hydroxide instead of distilled water. C. standard with the highest concentration was used in autozero. d. cuvette was misplaced such that the opaque side faces the lighti need help determining amount recovered in an extraction. i started with a .51g mix of naphlathene/benzoic acid. then, i ended up with the organic in the flask weighing 56g, with the initial weight of the flask without product being 46g. how do i determine amount recovered AND the % recovery?In the second paragraph you should define and describe the process of gas chromatography. In this paragraph answer the following questions: a) Why might it be necessary to dilute the sample? Approximately how much sample is used? b) Describe good injection technique. What sort of syringe is used in gas chromatography? c) What property of compounds will make the retention time longer or shorter? Use as an example ethyl acetate, propyl acetate, and butyl acetate, since these compounds are the ones we are studying in this experiment. d) What are a few different types of detectors and how do they work?
- Fractional distillation of a mixture of two compounds gives the following data after the GC analysis and peak integration: Peak 1 (corresponding to compound 1), area = 70.3 sq units Peak 2 (corresponding to compound 2), area = 28.7 sq units What was the original percentage composition of the two compounds in the mixture? Compound 1 = 61.5% Compound 2 = 38.5% Compound 1 = 71.0% Compound 2 = 29.0% O Compound 1 = 29.0% Compound 2 =71.0% Compound 1 = 41.0% Compound 2 = 59.0%2 Suppose a particular extraction proceeds with a distribution coefficient of 7.5. The mixture consists of a certain amount of caffeine dissolved 100 mL of water a. How much caffeine was originally used when 0.31 g of the organic compound was dissolved in water and 150 mL ether was used as extraction solvent b. How much was dissolved in ether?MAKE A METHODOLOGY : MATERIALS/ REAGENTS WITH SCHEMATIC DIAGRAM . THE PICTURE UPLOADED SERVES AS A GUIDE, DO THE SAME THING BASED FROM THE PIC. Procedure: Place 20 drops of each of 0.2M CuSO4 in a centrifuge tube. Then add 5 drops of freshly prepared 6M (NH4)2S to each centrifuge tube. Record your observation. Centrifuge the mixtures for 3 mins. and decant the supernatant liquid. Add 10 drops of DI water and 10 drops of 6M HNO3. Stir and boil the mixture in a hot water bath for 5 mins. centrifuge the mixture for 3 mins. Decant the supernatant solution from procedure 3. Discard the To each of the supernatant liquid, add 6 drops of 6M H2SO4. Allow themixtures to cool and 5 drops of DI water. To the mixtures in procedure 4, add few drops of concentrated NH3 until the solution becomes basic. Confirm using a litmus paper. Record your observation. Add 1 drop of 5M NaOH and 1 drop of 0.1 M SnCl2 to the centrifuge tube containing Bi3+ ion , centrifuge and decant the supernatant liquid. To…